Sam kicks a ball horizontally along a deck that is 5 m
above the ground.
The ball goes off the edge of the deck.
A model for the path of the ball once it leaves the deck is a parabola.
The equation of the parabola is y = ax^2+ bx + c.
The ball hits the ground at a horizontal distance of 3.1 m from the edge of the deck.
Find the values of a, b and c.